Eobb mackib



(No Model.)

R. MACKIE.

CIRCUIT POR ELEGIRIG LIGHTING.

No. 337,005. Patented Mar. Z, 1886.

@ @feg wm@ ma iduiTnn STATES PATENT OrricsQ ROBB MACKIE, OF TROY, ASSIGNOR TO JOHN B. TIBBITS, OF HOOSIOK, N. Y.

CERCUIT FOR'ELEGTREO MGi-VHN@ SPBCF-ECATIGEI forming part of Letters Patent No. 337,005, dated March 2, 1886.

Application led July 3, 1885. Serial No. 170,571.

To @ZZ wtom iti may concern:

Be it known that I, RoBB MACKIE, of Troy, in the county of Rensselaer and State of New York, have invented an Improvement in Oircuits for Electric Lighting, of which the following is a specification.

This invention is especially intended for closing the electric circuit through the fieldhelices when the dynamo-electric machine is in a state of rest, in order that the current may iirst pass through such held-helices when the machine is started, and I provide for switching the current automatically, so as to include a linecircuit with its lamps or other working devices in the same circuit as the iieldhelicesa By this improvement I am enabled to conv nect to the dynamo two external or line circuits-one containing arclamps in series or incandescent lam ps arranged in the usual manner, and the other containing incandescent lamps in multiple arc or multiple series-and to prevent the resistance of the incandescent lamps interfering with the development of the electrical energy, because the circuit containing such incandescent lamp is not included in the exciting-circuit until the field-helices are energized to the maximum amount.

In the drawing I have represented by a diagram my improvements.

A represents the commutator and brushes; A', the coils of the armature; G O, the iieldhelices,

B denotes an external or line circuit containing arc-lights placed in series.

D represents an external circuit containing incandescent lamps placed in multiple arc.

Gr is an electro-magnetic switch in the circuit of the incandescent lights.

E is an armature to the electro-magnet G. I is a spring to the said armature, and F is a contact-block'. v

Vhen the dynamo is not in operation, the spring I keeps the armature E in Contact with F. `When the machine is started, the electric circuit is completed and the current passes through the armature-helices A', held-helices O, and, by I?, through the armature E, thus en ergizing the field-helices to the maximum, and

(No model) the arc-lights in the circuit B are instantly brought into action, the said circuit B being a shunt to the circuit through the field-helices. If, now, the incandescent lamps are in circuit or are brought into circuit bya switch,the current divides at H, a portion passing through the electro-magnetic switch Gr and through the incandescent lamps, and the armature E is moved, breaking contact with the point F, thus causing the incandescent lamps in the circuit D to be included in the shunt-circuit through the field-helices..

It is to be understood that thenumber of incandescent lamps in the circuitl) is to be pro portioned to the current passing through the held-helices, and that the resistance of the iield-helices and the incandescent lamps is to be equal or greater than the resistance of the arclights in the circuit B. Ii', now, the incandescent lights are turned oti, or they should break, the current will not pass through the helix G, and the circuit through the eldhelices will be instantly restored by the spring I, closing contact automatically between E and F, so as not to interfere with the action ofthe machine in the arc-light circuit.

The dynamo should be provided with an automatic regulating device, by which the current developed will be in proportion to the demand, and there should be a resistance at It in the circuit of the field-helices equal,or nearly so, to the resistance of the incandescent lights, in order that the ultimate resistance in the circuit through the held-helices may not be materially changed byturning off or on the incandescent lights, and, if desired, each of the incandescent lamps can be provided with the automatic switch or cut-out G E F I and resistance R, so that any one incandescent lamp may be turned out.

The electro-magnetic switch may be made with a stationary core to attract the armatureswitch, or with a solenoid-core to move the switcha I claim as myinvention l. The combination, with the eld-helices in a dynamo, of an electro-magnetic switch and a branch circuit containing incandescent lamps, substantially as set forth, for directing thc current through the incandescent lamp netc switch to bring the incandescent lamps 1o after the eld-helices becomeY energized, subinto thc circuit of the field-helices, substanstantially as vset forth. tially as specified.

2. The combination, with the dynamo-elecl Signed by me this 17th day of June7 A. D.

5 tric machine containing a commutator, armal 1885. v

ture-coils, and field-helices, of a shunt-circuit v ROBB MACKIE. having arc-lights in serics, a circuit included .VVitnesscsz in the circuit of the field-helices and containing incandescent lights, and an electro-mag- GEO. S. HUBBELL, GEo. SIKEs. 

